Among all the nice changes introduced in Leopard, one not-so-nice change is the way it implements the Help system. Whenever you call up Help, a floating window opens in the foreground, refusing to move to the background and obscuring other open windows. That means you have to slide the Help window out of the way or constantly minimise it to the Dock. It's a real pain - especially if you work on a notebook or use a smaller display. Thankfully, Apple has included a hidden preference that allows you to change this behaviour.
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